gastric adenocarcinoma with dual differentiation toward neuroendocrine and α-fetoprotein-producing features: report of 2 cases
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ID: 181391
2017
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Abstract
Some gastric carcinomas show composite features of neuroendocrine carcinoma (NEC) and α-fetoprotein (AFP)-producing carcinoma, which are very rare; only a few cases have been reported to date. We reviewed an additional 2 such cases of gastric carcinoma, which were both advanced aggressive tumors showing regional lymph node metastasis and distant metastasis. Both cases were accompanied by ordinary adenocarcinoma forms, implying that they had preceded the NEC and AFP-producing carcinoma components. A distinctive feature was the finding suggestive of dual differentiation of tumor cells to neuroendocrine and AFP-producing phenotypes, which was identified even in the metastatic tumor in the regional lymph node. Because both tumors predominantly showed poorly differentiated forms, the final pathologic diagnosis must rely on the immunohistochemistry. Pathologists should always keep in mind the existence of such tumors for the correct diagnosis of some gastric carcinomas with specific phenotypes, especially in pathologic diagnosis on biopsy.
| Reference Key |
iida2017casegastric
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| Authors | ;Shun Iida;Shinichi Ban;Keizo Kato;Shinji Endo;Ryota Matsuo;Kosuke Hirano;Takashi Okuyama;Yukinori Yamagata;Yoshihiko Ueda |
| Journal | trends in genetics : tig |
| Year | 2017 |
| DOI |
10.1159/000480075
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| URL | |
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